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#!/bin/sh
# This uses a key supplied by the user
# If OpenSSL is installed, you can generate a pseudo-random key by running:
# openssl rand -hex 32
# To get a true random key, run:
# wget -q -O - 'https://www.random.org/cgi-bin/randbyte?nbytes=32&format=h' | tr -d ' \n'; echo
[ "$#" -lt 1 ] && echo "cluster_key_command usage: $0 %R [%p]" 1>&2 && exit 1
# Supports environment variable PROMPT
FD="$1"
[ ! -t "$FD" ] && echo "file descriptor $FD does not refer to a terminal" 1>&2 && exit 1
[ "$2" ] && PROMPT="$2"
# ----------------------------------------------------------------------
[ ! "$PROMPT" ] && PROMPT='Enter cluster key as 64 hexadecimal characters: '
stty -echo <&"$FD"
echo 1>&"$FD"
echo -n "$PROMPT" 1>&"$FD"
read KEY <&"$FD"
stty echo <&"$FD"
if [ "$(expr "$KEY" : '[0-9a-fA-F]*$')" -ne 64 ]
then echo 'invalid; must be 64 hexadecimal characters' 1>&2
exit 1
fi
echo "$KEY"
exit 0
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